She learns more about her jobA. day by dayB. day to dayC. one by dayD. one after one.

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(答案→)A. day by day
B. day to day
C. one by day
D. one after one.
解析： day  by day一天天地；day to day天天，日复一日；one by day无此说法；one after one一个接一个。一天天地她更加了解她的工作。结合语境可知选A。